[Mobhack]

A bunch of cyclists cannot sneak about like infantry do, when mounted. They take casualties worse than infantry do as well, hence size 2. The same applies to some conscript riflemen who can be size 2 due to being inept (USSR factory militia for Stalingrad IIRC is one).

The original SSI game only had the mounted icon for cyclists, cavalry and motorcyclists. We added formations with dismounting crews to some OOBs a decade (?) or so back. So if you want dismounting size 1 passengers, take one of those formations if your OOB has them. The original types really only remain since some scenarios used them, or or those who want "charging" cavalry (lancers do more melee damage on infantry and mounted, if they survive to do so. I rather like Polish lancers for cutting down fleeing riflemen, myself!)